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Steve Forbes says he'll vote for Donald Trump

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Forbes described Trump as "absolutely unique"

He said that Trump's VP choice could help him win the support of critics

(CNN)Steve Forbes, the chairman and editor-in-chief of Forbes Media, said Tuesday he was supporting Donald Trump, but that the presumptive Republican presidential nominee needs to "assuage the doubters" with his vice presidential pick.

"Well, I've said always that I would endorse the Republican nominee, and he's about to become that," Forbes told CNN's Poppy Harlow on "New Day."

"If it's somebody that people say, 'Hey this is a person with experience, not on the original Trump team, hey, maybe this guy can put it together,'" Forbes said. "That's what you have to do now -- assuage the doubters."

When asked who's Forbes' top pick for vice president among the five currently considered his top choices -- former Speaker of the House Newt Gingrich, Gov. Chris Christie, Gov. Mike Pence, Sen. Jeff Sessions and retired General Michael Flynn -- he said he's "not sure it's going to be any of them."

"He hasn't made his mind of up yet, so I don't know who he's going to pick," Forbes said. "I'm not going to bet a penny of my 401k on any of those."